Collapsible support



Dec. 12, 1944. H. c. JOHANSEN COLLAPSIBLE SUPPORT Filed Dec. 26 1941 3 Sheets-Sheet l Ewen/2hr.- ggarryLJoham'en Dec. 12, 1944. c JOHANSEN 2,364,851

COLLAPS IBLE SUPPORT Filed Dec. 26; 1941 3 Sheets-Sheet 2 l7 /9 F .2/ 6 2 ,4, 0 l6 &9 19 49 24 24 /8 fnvenm Ha 27y dbhanden. y

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Dec. 12, 1944. c, JOHANSEN 2,364,851

COLLAPS IBLE SUPPORT Filed Dec. 25, 1941 3 Sheets-Sheet 3 Patented Dec. 12, 1944 COLLAPSIBLB SUPPORT Harry G. Johansen, Michigan City, Ind., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application December 28, 1941, Serial No. 424,473

9 Claims. (01. 189-15) This invention relates .to collapsible supports and more particularly has reference to improvements in a portable derrick mast of the collapsible type.

An object of the present invention is to provide an improved collapsible support. Another object is to provide an improved portable derrick mast of the collapsible type. A further Object is to provide an improved collapsible derrick mast mounted on an automotive base and having improved operating means. Yet another object is to provide an improved collapsible derrick mast which may be folded into an extremely compact position during transport and may be quickly and readily raised into its operative position. Yet another object is to provide improvedmeans whereby the adjustable sections of the derrick mast may be folded during transport in an improved manner. A still further object is to provide an improved folding derrick mast having novel arrangements and combinations of parts. How these and other objects are accomplished, and the advantageous features of the invention will be best understood from the following detailed description wherein a preferred and illus-' trative embodiment is set forth, reference for the purpose being had to the accompanying drawings. in which:

Fig. 1 is a side elevational view of the portab derrick mast and an associated automotive base. the derrick mast being shown in its lowered transport position as indicated in full lines.

Fig. 2 is an end elevational view of the apparatus shown in Fig. 1, with the mast, mostly broken away, shown in an intermediate position.

Fig. 3 is a side elevational view of the derrick mast showing the same in its raised position as indicated in full lines.

Fig. 4 is an enlarged detail plan view showing a portion of the mast supporting structure.

Fig. 5 is an enlarged detail view showing the cable guide sheaves.

Fig. 6 is a detail view showing the hook for securing the pivoted mast sections in folded position.

Figs. '7 .to 12 inclusive are diagrammatic views illustrating the manner of operation of the derrick mast during its transition from one position 7 base, generally designated 2. It will be evident,

howeventhat the derrick mast may be mounted on anysuitable form of portable base other than that disclosed. The automotive base is herein in the form of an automobile truck having a platform 3 mounted on wheels 4 and having a usual operators cab 5 and a hood concealing the engine.

Mounted on the automobile truck near its opposite ends are front and rear upright supports 1 and 8, the rear supports being suitably braced. as at 9, and a horizontal frame l0 providing a longitudinal trackway II is supported at the maper ends of these upright supports above the automobile truck. As shown, the forward portion of the trackway-providing-frame. l0 overlies the cab and hood of the automobile truck and projects in advance of the front end of the latter.

The derrick mast has a base mast section II pivotally mounted at It at the upper ends of the rear upright supports 8 to swing in a vertical direction, and pivotally connected at it to the outer end of this base mast section is a relatively collapsible mast section II which carries at its end remote from its pivot usual cable guiding sheaves l6; Mounted on the relatively collapsible mast section II near the cable guiding sheaves is a transverse shaft l1 supported bysuitable bearing brackets is and carryin near'its outer ends rollers l9 adapted to run along the parallel tracks 20, 20 of the trackway H. Pivoted at 2! about an axis coincident with the pivotal axis I I is a hook 22 adapted to engage the transverse roller shaft l'l at the outer end of the relatively collapsible mast section for locking the mast sections together in their folded position. Journaled at 23 on suitable brackets is a transverse roller 25, and the roller brackets are carried by a transverse support 26 carried at the outer overhanging end of the trackway-providing frame to, and the relatively collapsible mast section is engageable with this roller at times during transition of the mast from the lowered folded position to its raised extended position and vice versa. The hingedly connected mast sections l2, l5, near their point of pivotal connection at H, are provided with flanges 21 and 28 respectively and these flanges are adapted to abut when the mast sections are in alined position with the mast extended, and bolts passing through suitable openings in these flanges, or other suitable attaching devices, secure these flanges in abutting relation to hold the mast sections firmly together in alined relation.

Any suitable form of power operated means may be employed for swinging the derrick mast about its pivot is and herein comprises a pair of hydraulic cylinders 29, 29 pivotally mounted at 30 at their lower ends on the truck platform and containing reciprocable-pistons having their upwardly projecting piston rods 3| pivotally connected at 32 to the lower mast section l2. When liquid under pressure is supplied from any suitable source to these hydraulic cylinders, the mast may be swung upwardly about its pivot l3 by power and when the liquid is exhausted from these cylinders under the control of suitable valve means, the mast may be lowered about its pivot. Since the means for controlling the supply of liquid under pressure to these hydraulic cylinders may assume any appropriate form and is well known, further description thereof is herein unnecessary.

As shown in full lines in Fig. 1, and as illustrated diagrammatically in Fig. 7, the mast during transport has its sections l2 and I5 folded together with the relatively collapsible mast section i5 underlying the base section l2 in the manner shown and with both sections overlying the automobile truck just above the horizontal guideway-providing-member l0. At this time, the mast sections are held together by the hook 22 which engages the transverse roller shaft IT in the manner shown in Fig. 6. When it is desired to rais the mast into its upright operative position, as shown in full lines in Fig. 3, liquid under pressure may be supplied to the hydraulic cylinders 29 to efl'ect upward swinging movement of the mast. During transition of the mast from its lowered transport position to its raised operative position and vice versa, when the appropriate position of the parts is reached, the hook 22 is released and the rollers l9, l9 at the outer end of the relatively collapsible mast section [5 roll along the tracks 20, 20 of the horizontal trackway I l, and when the rollers leave the trackway, the lower side of the collapsible mast section l5 engages the transverse roller 25 carried by the support ID.

The mode of use of the improved derrick mast will be clearly apparent from the description given. As previously mentioned, the hydraulic cylinders 29 may be operated to swing the folded mast sections upwardly about the mast pivot 13 from the lowered transport position shown in Fig. 7 to the raised intermediate position shown in Fig. 8. The hook 22 may then be released and the hydraulic cylinders may be operated to swing the mast downwardly about its pivot l3 so that the rollers I! at the outer end of the collapsible mast section i5 engage and roll along the parallel tracks 20, 20 of the horizontal trackway ll, thereby causing the mast sections to swing apart as shown in Fig. 9. As lowering of the mast is continued, the rollers l9 move off from the parallel tracks of the horizontal trackway and the lower side of the collapsible mast section engages the transverse roller 25, in the manner shown in Fig. 10, and upon further downward swinging movement of the mast, the base and relatively collapsible mast sections l2, ii are brought into alinement as shown in Fig. 11. When the mast sections are in their extended alined position, the flanges 21, 28 are in abutting relation, and these are then secured together by bolts so that the mast sections are rigidly connected. The hydraulic cylinders may then be operated to swing the extended mast upwardly about its pivot Hi from the lowered position shown in Fig. ll to the upright position shown in Fig. 12. When the derrick mast is in the raised operative position as shown in Fig. 12 it may be rigidly clamped to the truck platform in any suitable manner. The derrick mast may be lowered in similar manner to that above described, but in the reverse sequence, as will be obvious to those skilled in the art.

A hoisting mechanism such as a hoistof an oil well diamond drilling apparatus may be mounted on the truck platform beneath the derrick mast and the cable of this hoisting mechanism may b extended upwardly around the guiding sheaves it carried at the upper end of the derrick mast and the drop line of this cable may be provided with a usual load hook.

As a result of this invention, it will be noted that an improved collapsible derrick mast s Provided which may be quickly and easily raised and lowered as desired. It will further be evident that by the provision of the horizontal trackway and the associated guiding rollers, the derrick mast may be extended and lowered in an extremely efficient manner. Also, it will be evident that by the provision of the improved derrick mast structure disclosed, the mast may be folded into an extremely compact position during transport. Other uses and advantages of th improved derrick mast will be clearly apparent to those skilled in the art.

While there is in this application specifically described one form which the invention may as sume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. An adjustable support comprising a supporting base structure providing a horizontal guideway, foldable, pivotally connected, base and relatively collapsible support sections, said collapsible support section being swingable into folded position with respect to said base section and said base section being disposable in a lowered position with said collapsible support section in folded relation thereto, and said base sectidn being pivotally mounted on said supporting base structure for vertical swinging movement, means for swinging said base section about its pivot relative to said supporting base structure, said collapsible support section engaging and guided by 'said guideway during swinging of said sections about their respective pivots into and out of folded position, and guiding means on said supporting base structure with which said collapsible support section is engageable as it moves out of engagement with said guideway during swinging of said sections.

2. A collapsible derrick mast including a support providing a horizontal trackway, pivotally connected base and relatively collapsible mast sections pivotally mounted on said support for vertical swinging movement, said collapsible mast section being pivotally connected to said pivoted base section to swing relative thereto into collapsed position and said base section being disposable in a lowered position with said collapsible mast section in collapsed relation thereto, means for swinging said base section about its pivot relative to said support, and means for guiding the outer end of said collapsible mast section during swinging of said sections into and out of collapsed position including a. roller carried at the outer end of said collapsible section and engageable with said trackway, and a roller carried at one end of said support and with which said collapsible mast section is engageable as said first assess:

roller moves out of engagement with said track- Wfl-Y.

3. An adjustable support of the character described comprising foldable, base and relatively collapsible support sections pivotally connected together and relatively swingable from. their folded position into an alined extended position, means for guiding said collapsible support section during relative swinging of said sections into and out of their folded position, and means for swinging said support sections in a vertical direction, said sections when folded being first swingable upwardly as a unit and thereafter being swingable downwardly to effect relative swinging thereof into alined extended position, said guiding means guiding said collapsible section during such downward swinging of said sections.

4. An adjustable support of the character described comprising foldable, bas and relatively collapsible support sections pivotally connected together and relatively swingable from their folded position into an alined extended position, means for guiding said collapsible support section during relative swingin of said sections into and out of their folded position, means for swinging said support sections in a vertical direction, said sections when folded being first swingable upwardly as a unit and thereafter being swingable downwardly to effect relative swinging thereof into alined extended position, said guiding means guiding said collapsible section during such downward swinging of said sections, and means for securing said sections rigidly together when in alinement.

5. An adjustable support of th character described comprising foldable, base and relatively collapsible support sections pivotally connected together and relatively swingable from their folded position into an alined extended position, means for guiding said collapsible support section during relative swinging of said sections into andout of their folded position, means for swinging said support sections in a vertical direction, said sections when folded being first swingable upwardly as a unit and thereafter being swingable downwardly to eflect relative swinging thereof into alined extended position, said guiding means guiding said collapsible section during such downward swinging of said sections, means for secure ing said sections rigidly together when in alinement, and said support sections when secured together in alinement being swingable upwardly by said swinging means intoftheir raised operas tive supporting position.

6. In a collapsible derrick, a supporting structure, a mast pivotally mounted on said supporting structure to swing in a vertical direction relative thereto from its raised extended position to its lowered collapsed position and vice versa, said mast comprising a pivoted base section and a relatively swingable section pivotally connected to said base section, said sections being disposable in the lowered collapsed position thereof with one section extending reversely with respect to the other and in overlying relation to the latter, means for swinging said base section about its pivot, and means for guiding said relatively swingable mast section during swinging of said mast sections, said guiding means including a horizontal guideway on saidsupporting structure, said relatively swingable mast section having near the end thereof remote from its point of pivotal connection with said base section a guide engageable with said guideway, and said supportingstructure having a guide engaging said swingable mast section between the ends thereof when said first-mentioned guide is out of engagement with said guideway.

7. In a collapsible derrick mast, a support, a base mast section pivotaliy mounted on said support to swing in a vertical direction with respect thereto, a mast section pivotally connected to said base section and swingable with respect thereto into an extended position in alinement with said base section and into a folded position along one side of said base section, means for swingin said base mast section about its pivot relative to said support, said mast sections when in their lowered folded position being swingable upwardly in unison about the pivot of said base section, and said base section thereafter being swingable downwardly while said other mast section is free to swing relative to said base section, means coacting with said other mast section, as said base section is so swung downwardly, to eifect alinement of said mast sections, and means for rigidly securing said mast sections in alinement, said swinging means thereafter being operable to effect upward swinging of said alined mast sections as a unit about the pivot of said base section.

8. A collapsible derrick mast comprising a support, foldable, pivotally connected mast sections, one section constituting the base of the mast and the other section constituting a continuation of the base when the mast is in extended position,

means for swinging said base mast section about its pivot relative to said support from a lowered position to an upright position, means for securing said mast sections together in folded position,

said mast sections when in their folded lowered position being swingable upwardly while secured together about the pivot of said base section, and thereafter, upon release of said securing means, said mast sections being swingable downwardly while the same are free to swing apart, means coacting with one of said mast sections, as said sections are so swung downwardly, to effect alinement of. said mast sections, and'means for rigidly securing said mast sections together in their alined position, and said sections when secured in alinement being swingable upwardly by said swinging means about the pivot of said base section into an upright position on said support,

9. A collapsible derrick mast comprising a support, foldable, pivotally connected mast sections,. one section constituting the base of the mast and,

the other section constituting a continuation of I the base when the mast is in extended position,

meansior swinging said base mast section about its pivot relative to said support from a lowered position-to an upright position, means for securing said mast sections together in folded position,said mast sections when in their folded lowered position being swingable upwardly while secured together about the pivot of said base section, and thereafter, upon release of said securing means, said mast sections being swingable downwardly while the same are free to swing apart to effect alinement of said mast sections, means on said support for guiding the outer end of said pivoted mast section which constitutes a continuation of the base section during relative swinging of said mast sections, and means for rigidly securing said mast sections together in their alined position, said sections when secured in alinement being swingable upwardly by said swinging means about the pivot of said base section into an upright position on said support.

HARRY C. JOHANBEN. 

